Support beam



FIG. 1 is a top perspective view of a support beam showing our new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a front view thereof; and,

FIG. 6 is a rear view thereof.

The support beam is shown with a symbolic break in its length. The appearance of any portion of the article between the break lines forms no part of the claimed design. The uneven-length broken lines immediately adjacent to the shaded areas define the bounds of the claimed design and form no part thereof. The remaining dotted lines depict portions of the support beam that form no part of the claimed design. 

CLAIM The ornamental design for a support beam, as shown and described. 